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<p>&#x200B;    5&#x3001;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x591A;&#x4E2A;&#x4FEE;&#x6539;&#x8005;&#x7684;&#x573A;&#x666F;&#x3002; </p>
<p>&#x200B;    6&#x3001;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x9700;&#x8981;&#x63D0;&#x4F9B;&#x7ED9;&#x5176;&#x4ED6;&#x5BF9;&#x8C61;&#x8BBF;&#x95EE;&#xFF0C;&#x800C;&#x4E14;&#x5404;&#x4E2A;&#x8C03;&#x7528;&#x8005;&#x53EF;&#x80FD;&#x90FD;&#x9700;&#x8981;&#x4FEE;&#x6539;&#x5176;&#x503C;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x8003;&#x8651;&#x4F7F;&#x7528;&#x539F;&#x578B;&#x6A21;&#x5F0F;&#x62F7;&#x8D1D;&#x591A;&#x4E2A;&#x5BF9;&#x8C61;&#x4F9B;&#x8C03;&#x7528;&#x8005;&#x4F7F;&#x7528;&#x3002; </p>
<p>&#x200B;    7&#x3001;&#x5728;&#x5B9E;&#x9645;&#x9879;&#x76EE;&#x4E2D;&#xFF0C;&#x539F;&#x578B;&#x6A21;&#x5F0F;&#x5F88;&#x5C11;&#x5355;&#x72EC;&#x51FA;&#x73B0;&#xFF0C;&#x4E00;&#x822C;&#x662F;&#x548C;&#x5DE5;&#x5382;&#x65B9;&#x6CD5;&#x6A21;&#x5F0F;&#x4E00;&#x8D77;&#x51FA;&#x73B0;&#xFF0C;&#x901A;&#x8FC7; clone &#x7684;&#x65B9;&#x6CD5;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x7136;&#x540E;&#x7531;&#x5DE5;&#x5382;&#x65B9;&#x6CD5;&#x63D0;&#x4F9B;&#x7ED9;&#x8C03;&#x7528;&#x8005;&#x3002;&#x539F;&#x578B;&#x6A21;&#x5F0F;&#x5DF2;&#x7ECF;&#x4E0E; Java &#x878D;&#x4E3A;&#x6D51;&#x7136;&#x4E00;&#x4F53;&#xFF0C;&#x5927;&#x5BB6;&#x53EF;&#x4EE5;&#x968F;&#x624B;&#x62FF;&#x6765;&#x4F7F;&#x7528;&#x3002;</p>
<p><img src="https://tva1.sinaimg.cn/large/e6c9d24ely1h3nt568r1tj21520kydi3.jpg" alt=""></p>
<p><img src="../Users/mac/Library/Application Support/typora-user-images/image-20220628114841028.png" alt=""></p>
<p>&#x521B;&#x5EFA;&#x62BD;&#x8C61;&#x7C7B; Shape</p>
<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Shape</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">Cloneable</span> </span>{

   <span class="hljs-keyword">private</span> String id;
   <span class="hljs-keyword">protected</span> String type;

   <span class="hljs-function"><span class="hljs-keyword">abstract</span> <span class="hljs-keyword">void</span> <span class="hljs-title">draw</span><span class="hljs-params">()</span></span>;

   <span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getType</span><span class="hljs-params">()</span></span>{
      <span class="hljs-keyword">return</span> type;
   }

   <span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getId</span><span class="hljs-params">()</span> </span>{
      <span class="hljs-keyword">return</span> id;
   }

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setId</span><span class="hljs-params">(String id)</span> </span>{
      <span class="hljs-keyword">this</span>.id = id;
   }

   <span class="hljs-function"><span class="hljs-keyword">public</span> Object <span class="hljs-title">clone</span><span class="hljs-params">()</span> </span>{
      Object clone = <span class="hljs-keyword">null</span>;
      <span class="hljs-keyword">try</span> {
         clone = <span class="hljs-keyword">super</span>.clone();
      } <span class="hljs-keyword">catch</span> (CloneNotSupportedException e) {
         e.printStackTrace();
      }
      <span class="hljs-keyword">return</span> clone;
   }
}
</code></pre>
<p>&#x521B;&#x5EFA;&#x5177;&#x4F53;&#x7684;&#x5B9E;&#x73B0;&#x7C7B;</p>
<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Rectangle</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Shape</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">Rectangle</span><span class="hljs-params">()</span></span>{
     type = <span class="hljs-string">&quot;Rectangle&quot;</span>;
   }

   <span class="hljs-meta">@Override</span>
   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">draw</span><span class="hljs-params">()</span> </span>{
      System.out.println(<span class="hljs-string">&quot;Inside Rectangle::draw() method.&quot;</span>);
   }
}

<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Square</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Shape</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">Square</span><span class="hljs-params">()</span></span>{
     type = <span class="hljs-string">&quot;Square&quot;</span>;
   }

   <span class="hljs-meta">@Override</span>
   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">draw</span><span class="hljs-params">()</span> </span>{
      System.out.println(<span class="hljs-string">&quot;Inside Square::draw() method.&quot;</span>);
   }
}

<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Circle</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Shape</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">Circle</span><span class="hljs-params">()</span></span>{
     type = <span class="hljs-string">&quot;Circle&quot;</span>;
   }

   <span class="hljs-meta">@Override</span>
   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">draw</span><span class="hljs-params">()</span> </span>{
      System.out.println(<span class="hljs-string">&quot;Inside Circle::draw() method.&quot;</span>);
   }
}
</code></pre>
<p>&#x83B7;&#x53D6;&#x5B9E;&#x4F53;&#x7C7B;&#x5BF9;&#x8C61;&#xFF0C;&#x5E76;&#x5B58;&#x50A8;&#x5230;&#x96C6;&#x5408;&#x4E2D;</p>
<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ShapeCache</span> </span>{

   <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> Hashtable&lt;String, Shape&gt; shapeMap 
      = <span class="hljs-keyword">new</span> Hashtable&lt;String, Shape&gt;();

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> Shape <span class="hljs-title">getShape</span><span class="hljs-params">(String shapeId)</span> </span>{
      Shape cachedShape = shapeMap.get(shapeId);
      <span class="hljs-keyword">return</span> (Shape) cachedShape.clone();
   }

   <span class="hljs-comment">// &#x5BF9;&#x6BCF;&#x79CD;&#x5F62;&#x72B6;&#x90FD;&#x8FD0;&#x884C;&#x6570;&#x636E;&#x5E93;&#x67E5;&#x8BE2;&#xFF0C;&#x5E76;&#x521B;&#x5EFA;&#x8BE5;&#x5F62;&#x72B6;</span>
   <span class="hljs-comment">// shapeMap.put(shapeKey, shape);</span>
   <span class="hljs-comment">// &#x4F8B;&#x5982;&#xFF0C;&#x6211;&#x4EEC;&#x8981;&#x6DFB;&#x52A0;&#x4E09;&#x79CD;&#x5F62;&#x72B6;</span>
   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">loadCache</span><span class="hljs-params">()</span> </span>{
      Circle circle = <span class="hljs-keyword">new</span> Circle();
      circle.setId(<span class="hljs-string">&quot;1&quot;</span>);
      shapeMap.put(circle.getId(),circle);

      Square square = <span class="hljs-keyword">new</span> Square();
      square.setId(<span class="hljs-string">&quot;2&quot;</span>);
      shapeMap.put(square.getId(),square);

      Rectangle rectangle = <span class="hljs-keyword">new</span> Rectangle();
      rectangle.setId(<span class="hljs-string">&quot;3&quot;</span>);
      shapeMap.put(rectangle.getId(),rectangle);
   }
}
</code></pre>
<p>&#x5BA2;&#x6237;&#x7AEF;&#x8C03;&#x7528;&#x6D4B;&#x8BD5;&#xFF1A;</p>
<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">PrototypePatternDemo</span> </span>{
   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span> </span>{
      ShapeCache.loadCache();

      Shape clonedShape = (Shape) ShapeCache.getShape(<span class="hljs-string">&quot;1&quot;</span>);
      System.out.println(<span class="hljs-string">&quot;Shape : &quot;</span> + clonedShape.getType());        

      Shape clonedShape2 = (Shape) ShapeCache.getShape(<span class="hljs-string">&quot;2&quot;</span>);
      System.out.println(<span class="hljs-string">&quot;Shape : &quot;</span> + clonedShape2.getType());        

      Shape clonedShape3 = (Shape) ShapeCache.getShape(<span class="hljs-string">&quot;3&quot;</span>);
      System.out.println(<span class="hljs-string">&quot;Shape : &quot;</span> + clonedShape3.getType());        
   }
}
</code></pre>
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